Ray, James Lee, author
Houghton Mifflin, 1987
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Kaarbo, Juliet, author
Wadsworth, Cengage Learning, 2011
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Kegley, Charles W. (Charles William), Jr., author
Wardsworth, 2010
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Mireille Marcia Karman, author
Univesitas Indonesia. Fakultas Ilmu Sosial Dan Politik, 2014
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Mansbach, Richard W., author
Houghton Miffiln, 2000
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